Lead forwarding mechanism retainer for thurst action mechanical pencil

Abstract

A thrust-action mechanical pencil having a lead-forwarding mechanism and an outer sleeve, the lead-forwarding mechanism being inserted from the rear end of the outer sleeve. An elastic member to prevent looseness is inserted between a chuck ring sleeve, and an inner ring provided on the inside of the outer sleeve to prevent forward movement. A tubular retaining sleeve having a full length slit is installed between a mouth piece and a stepped portion of the lead forewarding mechanism. A retaining portion on the forward end of the retaining sleeve is set between the mouth piece and the forward end of the outer sleeve to retain the lead-forwarding mechanism in the pencil.

We claim: 
     
       1. A thrust-action mechanical pencil having a lead forwarding mechanism inserted in an outer sleeve characterized by a chuck ring sleeve (3) on said lead forwarding mechanism (2); an inner retaining part (4) secured to an inside forward portion of said outer sleeve (1); an elastic member (5) positioned between said inner retaining part (4) and said chuck ring sleeve (3); said elastic member constructed and positioned to restrain said chuck ring sleeve (3); a mouth piece (7) attached to a forward end of said chuck ring sleeve (3); said moutn piece (7) extending from a forward end of said chuck ring sleeve (3) out of said outer sleeve (1); a radially compressible sleeve (10) mounted, around said mouth piece (7) between a shoulder (12) on a forward end of said mouth piece (7) and a radially projecting step (8) on a rearward portion of said mouth piece (7) and a radially projecting step (8) on a rearward portion of said mouth piece (7); said radially compressible retaining sleeve (10) having a raised retaining portion (11), said raised portion being set between said shoulder (12) on said mouth piece (7) and the forward end of said outer sleeve (1). 
     
     
       2. The thrust-action mechanical pencil according to claim 1 in which said retaining sleeve (10) is in a rolled tubular shape having a full length slit allowing said retaining sleeve to compress radially. 
     
     
       3. The thrust-action mechanical pencil according to claim 2 in which said retaining sleeve (10) has a partial slit (9a) opposite said full length slit (9). 
     
     
       4. The thrust-action mechanical pencil according to claim 3 in which said raised retaining portion (11) of said retaining sleeve (10) is an outward projecting ridge. 
     
     
       5. A thrust-action mechanical pencil according to claim 1 in which said raised retaining portion (11) of said retaining sleeve (10) is an outward projecting ridge. 
     
     
       6. The thrust-action mechanical pencil according to claim 1 in which said radially compressible retaining sleeve (10) has a pair of slits (9a) on opposite sides extending approximately half the length of the sleeve, allowing said retaining sleeve to compress radially. 
     
     
       7. A thrust-action mechanical pencil having a lead forwarding mechanism (2) inserted and retained in an outer sleeve (1) from the rear comprising; a chuck ring sleeve (3) on said lead forwarding mechanism (2); an inner support member (4) in a bowed end said outer sleeve; an elastic member between said chuck ring sleeve (3) and said inner support member (4) for firmly retaining a lead forwarding member (14); a mouth piece (7) formed on a forward member (6) attached to said chuck ring sleeve (3); a compressible tubular retaining sleeve (10) mounted on said forward member (6) behind said mouth piece (7) and forward of a stepped portion (8) of said forward member (6); said tubular retaining sleeve (10) having a retaining projection (11), said retaining projection (11) being set between the forward end of said outer sleeve and said mouth piece (7) thereby locking and securing said lead-forwarding mechanism (2) in said pencil. 
     
     
       8. A thrust-action mechanical pencil according to claim 6 in which said retaining sleeve (10) is in a rolled tubular shape having a full length slit allowing said retaining sleeve (10) to compress radially. 
     
     
       9. A thrust-action mechanical pencil according to claim 7 in which said retaining sleeve (10) has a partial slit (9a) opposite said full length slit (9). 
     
     
       10. A thrust-action mechanical pencil according to claim 9 in which said retaining projection (11) of said retaining sleeve (10) is an outward projecting ridge. 
     
     
       11. A thrust-action mechanical pencil according to claim 7 in which said raised retaining projection (11) of said retaining sleeve (10) is an outward projecting ridge. 
     
     
       12. A thrust-action mechanical pencil according to claim 7 in which said retaining sleeve (10) has a pair of slits on opposite sides extending approximately half the length of the sleeve allowing said retaining sleeve (10) to compress radially.